| Combeite Mineral Data |
General Combeite Information |
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| Na2Ca2Si3O9 | |||
| Molecular Weight = 354.39 gm | |||
| Sodium 12.97 % Na 17.49 % Na2O | |||
| Calcium 22.62 % Ca 31.65 % CaO | |||
| Silicon 23.78 % Si 50.86 % SiO2 | |||
| Oxygen 40.63 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Na2Ca2Si3O9 | |||
| Valid Species (Pre-IMA) 1957 | |||
| Link to MinDat.org Location Data. | |||
Combeite Image | |||
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Combeite Crystallography |
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| a:c = 1:1.25839 | |||
| a = 10.48, c = 13.188, Z = 6; V = 1,254.39 Den(Calc)= 2.81 | |||
| Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: P 3221,P 3121 | |||
| By Intensity(I/Io): 2.657(1), 2.607(0.8), 3.304(0.7), | |||
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Mouse |
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Physical Properties of Combeite |
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| None | |||
| Colorless. | |||
| 2.844 | |||
| Transparent | |||
| white | |||
Optical Properties of Combeite |
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| CI meas= -0.023 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.036 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2128,KPDmeas= 0.2103,KC= 0.2055 |
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| Uniaxial (+), w=1.598, e=1.598, bire=0.0000. | |||
Calculated Properties of Combeite |
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relectron=2.82 gm/cc |
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| Fermion Index = 0.0116 Boson Index = 0.9884 |
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PECombeite = 3.90 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Combeite is Not Radioactive |
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Combeite Classification |
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| 61.1.2a.5 (61)Cyclosilicate Six-Membered Rings | |||
| (61.1)with [Si6O18] rings; possible (OH) and Al substitution | |||
| (61.1.2a)Lovozerite group (HEX and HEX-R subgroup) | |||
| VIII/E.15-10 VIII - Silicates | |||
| VIII/E - Cyklosilicates, six rings [Si6O18]12- | |||
| VIII/E.15 - Combeite - Kostylevite series | |||
Other Combeite Information |
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| PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | |||
| Links to other databases for Combeite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Combeite using: Visit our Advertisers for Combeite : Translate Combeite Mineral Data : Ask about Combeite here : Print or Cut-and-Paste your Combeite Specimen Label here :
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